interface Interface {
  defaultFunction(): Interface;
  otherDefaultFunction(): Interface;
  unrelatedOtherFunction(): boolean;
  someProperty: string;
}

const functions = [
  defaultFunction: (arg: string) => true;
  otherDefaultFunction: (arg: number) => true;
]

const customFunctions = [
  someFunctionWithAName: (arg: boolean, arg2: string) => true;
]

someFunction(): Interface;